Offering safety and portability, the new wireless instant fence pif 300 from Petsafe is the first electronic containment system with instant installation. If you can plug in a cord, you can install instant fence: no unattractive poles to set up and no wires to bury. Instant fence uses a constant radio signal to create a "stay zone". When your pet leaves the area, he receives a mild correction until he returns to the containment area or until approximately 35 seconds have passed. Since Petsafe instant fence is completely portable, you can take it and your pet wherever you go. So your pet is safe, and your mind is at ease. Containment it is ideal for flat yards, and portable easy to install creates a boundary circle with a 180 ft. Diameter includes new, 2.5-ounce. Waterproof pif-275-19 receiver uses 6 volt battery module operates multiple collars system includes 50 training flags incase of power outage the system turns off the collar containment area can be increased with additional if-100 transmitters.